Polaritons are confined hybrid light-matter excitations holding potential for optoelectronic and sensing applications, but their characterization is usually limited to optical spectroscopy. Here, the authors report the electrical spectroscopy of mid-infrared plasmon-phonon polaritons in Au/hBN/graphene nanoresonators, showing high lateral confinement and quality factors.
- Sebastián Castilla
- Hitesh Agarwal
- Frank H. L. Koppens
